(19)
(11) EP 0 577 509 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.03.1995 Bulletin 1995/13

(43) Date of publication A2:
05.01.1994 Bulletin 1994/01

(21) Application number: 93401688.2

(22) Date of filing: 30.06.1993
(51) International Patent Classification (IPC)5: B65D 75/68, B65D 65/02
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 30.06.1992 JP 173393/92
31.07.1992 JP 205590/92

(71) Applicant: SONY CORPORATION
Tokyo (JP)

(72) Inventors:
  • Ozaki, Hiroshi, c/o Sony Corporation
    Shinagawa-ku, Tokyo (JP)
  • Seki, Seizo, c/o Sony Corporation
    Shinagawa-ku, Tokyo (JP)

(74) Representative: Thévenet, Jean-Bruno et al
Cabinet Beau de Loménie 158, rue de l'Université
75340 Paris Cédex 07
75340 Paris Cédex 07 (FR)


(56) References cited: : 
   
       


    (54) Method for wrapping up a cassette case in thin film


    (57) There is provided a wrapping method in which a wrapped product is wrapped by a sheath film and partly-overlapped portions of the sheath film are melt-bonded by heat to heat-seal the sheath film. When the user opens the sheath film, the user can tear the same with ease. A heat sealing area of the sheath film (1) is printed by a halftone printing portion (10) to uniformly reduce the whole bonding area, thereby decreasing the bonding strength.






    Search report